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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Simulation of non-uniform sediment transport in a german reservoir with the ssiim model and sensitiv...
Simulation of non-uniform sediment transport in a german reservoir with the ssiim model and sensitivity analysis
Numerical models have been widely used to calculate long-term sediment deposition and erosion in reservoirs. This study
investigates the river morphodynamic processes in the Iffezheim reservoir at the Upper Rhine River in Germany with nonuniform
bed composition. The computational fluid dynamic model SSIIM is applied to calculate the flow. SSIIM solves the
three-dimensional Reynolds averaged Navier-Stokes equations with the k-ŠĆ turbulence model on unstructured grids. The
suspended load transport is simulated with the convection-diffusion equation, and the equilibrium sediment concentration
is calculated by the empirical formula of van Rijn (2007). Nine sediment size fractions are chosen to represent the nonuniform
sediment mixture. The purpose of the study is to determine the sensitivity of a set of parameters on the results
and investigate whether the bed elevation changes can be accurately simulated.
During the simulation of the morphological changes with constant sediment inflow in the Iffezheim reservoir, it has been
observed that minor changes in the morphodynamic parameters significantly influence the results concerning the sediment
erosion and deposition, e.g. the settling velocity, the thickness of the sediment active layer and the numerical parameters
time step and number of iterations for the sediment transport equation. The impact of these parameters on the bed change
is investigated in the study and the accordingly chosen parameter values are applied in the ensuing time-dependent
simulation. The erosion and deposition predictions have been compared to measured data of regular bed change surveys.
The results of the simulations are in reasonably well agreement with the measured data.
File Size : 667,390 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 18/08/2015
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